virt/kvm/kvm_main.c

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * This module enables machines with Intel VT-x extensions to run virtual
   5  * machines without emulation or binary translation.
   6  *
   7  * Copyright (C) 2006 Qumranet, Inc.
   8  *
   9  * Authors:
  10  *   Avi Kivity   <avi@qumranet.com>
  11  *   Yaniv Kamay  <yaniv@qumranet.com>
  12  *
  13  * This work is licensed under the terms of the GNU GPL, version 2.  See
  14  * the COPYING file in the top-level directory.
  15  *
  16  */
  17
  18 #include "iodev.h"
  19
  20 #include <linux/kvm_host.h>
  21 #include <linux/kvm.h>
  22 #include <linux/module.h>
  23 #include <linux/errno.h>
  24 #include <linux/percpu.h>
  25 #include <linux/mm.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/reboot.h>
  29 #include <linux/debugfs.h>
  30 #include <linux/highmem.h>
  31 #include <linux/file.h>
  32 #include <linux/sysdev.h>
  33 #include <linux/cpu.h>
  34 #include <linux/sched.h>
  35 #include <linux/cpumask.h>
  36 #include <linux/smp.h>
  37 #include <linux/anon_inodes.h>
  38 #include <linux/profile.h>
  39 #include <linux/kvm_para.h>
  40 #include <linux/pagemap.h>
  41 #include <linux/mman.h>
  42 #include <linux/swap.h>
  43 #include <linux/bitops.h>
  44 #include <linux/spinlock.h>
  45 #include <linux/compat.h>
  46 #include <linux/srcu.h>
  47 #include <linux/hugetlb.h>
  48 #include <linux/slab.h>
  49
  50 #include <asm/processor.h>
  51 #include <asm/io.h>
  52 #include <asm/uaccess.h>
  53 #include <asm/pgtable.h>
  54 #include <asm-generic/bitops/le.h>
  55
  56 #include "coalesced_mmio.h"
  57
  58 #define CREATE_TRACE_POINTS
  59 #include <trace/events/kvm.h>
  60
  61 MODULE_AUTHOR("Qumranet");
  62 MODULE_LICENSE("GPL");
  63
  64 /*
  65  * Ordering of locks:
  66  *
  67  *              kvm->lock --> kvm->slots_lock --> kvm->irq_lock
  68  */
  69
  70 DEFINE_SPINLOCK(kvm_lock);
  71 LIST_HEAD(vm_list);
  72
  73 static cpumask_var_t cpus_hardware_enabled;
  74 static int kvm_usage_count = 0;
  75 static atomic_t hardware_enable_failed;
  76
  77 struct kmem_cache *kvm_vcpu_cache;
  78 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
  79
  80 static __read_mostly struct preempt_ops kvm_preempt_ops;
  81
  82 struct dentry *kvm_debugfs_dir;
  83
  84 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
  85                            unsigned long arg);
  86 static int hardware_enable_all(void);
  87 static void hardware_disable_all(void);
  88
  89 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
  90
  91 static bool kvm_rebooting;
  92
  93 static bool largepages_enabled = true;
  94
  95 struct page *hwpoison_page;
  96 pfn_t hwpoison_pfn;
  97
  98 inline int kvm_is_mmio_pfn(pfn_t pfn)
  99 {
 100         if (pfn_valid(pfn)) {
 101                 struct page *page = compound_head(pfn_to_page(pfn));
 102                 return PageReserved(page);
 103         }
 104
 105         return true;
 106 }
 107
 108 /*
 109  * Switches to specified vcpu, until a matching vcpu_put()
 110  */
 111 void vcpu_load(struct kvm_vcpu *vcpu)
 112 {
 113         int cpu;
 114
 115         mutex_lock(&vcpu->mutex);
 116         cpu = get_cpu();
 117         preempt_notifier_register(&vcpu->preempt_notifier);
 118         kvm_arch_vcpu_load(vcpu, cpu);
 119         put_cpu();
 120 }
 121
 122 void vcpu_put(struct kvm_vcpu *vcpu)
 123 {
 124         preempt_disable();
 125         kvm_arch_vcpu_put(vcpu);
 126         preempt_notifier_unregister(&vcpu->preempt_notifier);
 127         preempt_enable();
 128         mutex_unlock(&vcpu->mutex);
 129 }
 130
 131 static void ack_flush(void *_completed)
 132 {
 133 }
 134
 135 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
 136 {
 137         int i, cpu, me;
 138         cpumask_var_t cpus;
 139         bool called = true;
 140         struct kvm_vcpu *vcpu;
 141
 142         zalloc_cpumask_var(&cpus, GFP_ATOMIC);
 143
 144         raw_spin_lock(&kvm->requests_lock);
 145         me = smp_processor_id();
 146         kvm_for_each_vcpu(i, vcpu, kvm) {
 147                 if (test_and_set_bit(req, &vcpu->requests))
 148                         continue;
 149                 cpu = vcpu->cpu;
 150                 if (cpus != NULL && cpu != -1 && cpu != me)
 151                         cpumask_set_cpu(cpu, cpus);
 152         }
 153         if (unlikely(cpus == NULL))
 154                 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
 155         else if (!cpumask_empty(cpus))
 156                 smp_call_function_many(cpus, ack_flush, NULL, 1);
 157         else
 158                 called = false;
 159         raw_spin_unlock(&kvm->requests_lock);
 160         free_cpumask_var(cpus);
 161         return called;
 162 }
 163
 164 void kvm_flush_remote_tlbs(struct kvm *kvm)
 165 {
 166         if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
 167                 ++kvm->stat.remote_tlb_flush;
 168 }
 169
 170 void kvm_reload_remote_mmus(struct kvm *kvm)
 171 {
 172         make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
 173 }
 174
 175 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 176 {
 177         struct page *page;
 178         int r;
 179
 180         mutex_init(&vcpu->mutex);
 181         vcpu->cpu = -1;
 182         vcpu->kvm = kvm;
 183         vcpu->vcpu_id = id;
 184         init_waitqueue_head(&vcpu->wq);
 185
 186         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 187         if (!page) {
 188                 r = -ENOMEM;
 189                 goto fail;
 190         }
 191         vcpu->run = page_address(page);
 192
 193         r = kvm_arch_vcpu_init(vcpu);
 194         if (r < 0)
 195                 goto fail_free_run;
 196         return 0;
 197
 198 fail_free_run:
 199         free_page((unsigned long)vcpu->run);
 200 fail:
 201         return r;
 202 }
 203 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
 204
 205 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 206 {
 207         kvm_arch_vcpu_uninit(vcpu);
 208         free_page((unsigned long)vcpu->run);
 209 }
 210 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 211
 212 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 213 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
 214 {
 215         return container_of(mn, struct kvm, mmu_notifier);
 216 }
 217
 218 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
 219                                              struct mm_struct *mm,
 220                                              unsigned long address)
 221 {
 222         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 223         int need_tlb_flush, idx;
 224
 225         /*
 226          * When ->invalidate_page runs, the linux pte has been zapped
 227          * already but the page is still allocated until
 228          * ->invalidate_page returns. So if we increase the sequence
 229          * here the kvm page fault will notice if the spte can't be
 230          * established because the page is going to be freed. If
 231          * instead the kvm page fault establishes the spte before
 232          * ->invalidate_page runs, kvm_unmap_hva will release it
 233          * before returning.
 234          *
 235          * The sequence increase only need to be seen at spin_unlock
 236          * time, and not at spin_lock time.
 237          *
 238          * Increasing the sequence after the spin_unlock would be
 239          * unsafe because the kvm page fault could then establish the
 240          * pte after kvm_unmap_hva returned, without noticing the page
 241          * is going to be freed.
 242          */
 243         idx = srcu_read_lock(&kvm->srcu);
 244         spin_lock(&kvm->mmu_lock);
 245         kvm->mmu_notifier_seq++;
 246         need_tlb_flush = kvm_unmap_hva(kvm, address);
 247         spin_unlock(&kvm->mmu_lock);
 248         srcu_read_unlock(&kvm->srcu, idx);
 249
 250         /* we've to flush the tlb before the pages can be freed */
 251         if (need_tlb_flush)
 252                 kvm_flush_remote_tlbs(kvm);
 253
 254 }
 255
 256 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
 257                                         struct mm_struct *mm,
 258                                         unsigned long address,
 259                                         pte_t pte)
 260 {
 261         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 262         int idx;
 263
 264         idx = srcu_read_lock(&kvm->srcu);
 265         spin_lock(&kvm->mmu_lock);
 266         kvm->mmu_notifier_seq++;
 267         kvm_set_spte_hva(kvm, address, pte);
 268         spin_unlock(&kvm->mmu_lock);
 269         srcu_read_unlock(&kvm->srcu, idx);
 270 }
 271
 272 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
 273                                                     struct mm_struct *mm,
 274                                                     unsigned long start,
 275                                                     unsigned long end)
 276 {
 277         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 278         int need_tlb_flush = 0, idx;
 279
 280         idx = srcu_read_lock(&kvm->srcu);
 281         spin_lock(&kvm->mmu_lock);
 282         /*
 283          * The count increase must become visible at unlock time as no
 284          * spte can be established without taking the mmu_lock and
 285          * count is also read inside the mmu_lock critical section.
 286          */
 287         kvm->mmu_notifier_count++;
 288         for (; start < end; start += PAGE_SIZE)
 289                 need_tlb_flush |= kvm_unmap_hva(kvm, start);
 290         spin_unlock(&kvm->mmu_lock);
 291         srcu_read_unlock(&kvm->srcu, idx);
 292
 293         /* we've to flush the tlb before the pages can be freed */
 294         if (need_tlb_flush)
 295                 kvm_flush_remote_tlbs(kvm);
 296 }
 297
 298 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
 299                                                   struct mm_struct *mm,
 300                                                   unsigned long start,
 301                                                   unsigned long end)
 302 {
 303         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 304
 305         spin_lock(&kvm->mmu_lock);
 306         /*
 307          * This sequence increase will notify the kvm page fault that
 308          * the page that is going to be mapped in the spte could have
 309          * been freed.
 310          */
 311         kvm->mmu_notifier_seq++;
 312         /*
 313          * The above sequence increase must be visible before the
 314          * below count decrease but both values are read by the kvm
 315          * page fault under mmu_lock spinlock so we don't need to add
 316          * a smb_wmb() here in between the two.
 317          */
 318         kvm->mmu_notifier_count--;
 319         spin_unlock(&kvm->mmu_lock);
 320
 321         BUG_ON(kvm->mmu_notifier_count < 0);
 322 }
 323
 324 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
 325                                               struct mm_struct *mm,
 326                                               unsigned long address)
 327 {
 328         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 329         int young, idx;
 330
 331         idx = srcu_read_lock(&kvm->srcu);
 332         spin_lock(&kvm->mmu_lock);
 333         young = kvm_age_hva(kvm, address);
 334         spin_unlock(&kvm->mmu_lock);
 335         srcu_read_unlock(&kvm->srcu, idx);
 336
 337         if (young)
 338                 kvm_flush_remote_tlbs(kvm);
 339
 340         return young;
 341 }
 342
 343 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
 344                                      struct mm_struct *mm)
 345 {
 346         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 347         int idx;
 348
 349         idx = srcu_read_lock(&kvm->srcu);
 350         kvm_arch_flush_shadow(kvm);
 351         srcu_read_unlock(&kvm->srcu, idx);
 352 }
 353
 354 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
 355         .invalidate_page        = kvm_mmu_notifier_invalidate_page,
 356         .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
 357         .invalidate_range_end   = kvm_mmu_notifier_invalidate_range_end,
 358         .clear_flush_young      = kvm_mmu_notifier_clear_flush_young,
 359         .change_pte             = kvm_mmu_notifier_change_pte,
 360         .release                = kvm_mmu_notifier_release,
 361 };
 362
 363 static int kvm_init_mmu_notifier(struct kvm *kvm)
 364 {
 365         kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
 366         return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
 367 }
 368
 369 #else  /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
 370
 371 static int kvm_init_mmu_notifier(struct kvm *kvm)
 372 {
 373         return 0;
 374 }
 375
 376 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
 377
 378 static struct kvm *kvm_create_vm(void)
 379 {
 380         int r = 0, i;
 381         struct kvm *kvm = kvm_arch_create_vm();
 382
 383         if (IS_ERR(kvm))
 384                 goto out;
 385
 386         r = hardware_enable_all();
 387         if (r)
 388                 goto out_err_nodisable;
 389
 390 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 391         INIT_HLIST_HEAD(&kvm->mask_notifier_list);
 392         INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
 393 #endif
 394
 395         r = -ENOMEM;
 396         kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
 397         if (!kvm->memslots)
 398                 goto out_err;
 399         if (init_srcu_struct(&kvm->srcu))
 400                 goto out_err;
 401         for (i = 0; i < KVM_NR_BUSES; i++) {
 402                 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
 403                                         GFP_KERNEL);
 404                 if (!kvm->buses[i]) {
 405                         cleanup_srcu_struct(&kvm->srcu);
 406                         goto out_err;
 407                 }
 408         }
 409
 410         r = kvm_init_mmu_notifier(kvm);
 411         if (r) {
 412                 cleanup_srcu_struct(&kvm->srcu);
 413                 goto out_err;
 414         }
 415
 416         kvm->mm = current->mm;
 417         atomic_inc(&kvm->mm->mm_count);
 418         spin_lock_init(&kvm->mmu_lock);
 419         raw_spin_lock_init(&kvm->requests_lock);
 420         kvm_eventfd_init(kvm);
 421         mutex_init(&kvm->lock);
 422         mutex_init(&kvm->irq_lock);
 423         mutex_init(&kvm->slots_lock);
 424         atomic_set(&kvm->users_count, 1);
 425         spin_lock(&kvm_lock);
 426         list_add(&kvm->vm_list, &vm_list);
 427         spin_unlock(&kvm_lock);
 428 out:
 429         return kvm;
 430
 431 out_err:
 432         hardware_disable_all();
 433 out_err_nodisable:
 434         for (i = 0; i < KVM_NR_BUSES; i++)
 435                 kfree(kvm->buses[i]);
 436         kfree(kvm->memslots);
 437         kfree(kvm);
 438         return ERR_PTR(r);
 439 }
 440
 441 /*
 442  * Free any memory in @free but not in @dont.
 443  */
 444 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 445                                   struct kvm_memory_slot *dont)
 446 {
 447         int i;
 448
 449         if (!dont || free->rmap != dont->rmap)
 450                 vfree(free->rmap);
 451
 452         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
 453                 vfree(free->dirty_bitmap);
 454
 455
 456         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
 457                 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
 458                         vfree(free->lpage_info[i]);
 459                         free->lpage_info[i] = NULL;
 460                 }
 461         }
 462
 463         free->npages = 0;
 464         free->dirty_bitmap = NULL;
 465         free->rmap = NULL;
 466 }
 467
 468 void kvm_free_physmem(struct kvm *kvm)
 469 {
 470         int i;
 471         struct kvm_memslots *slots = kvm->memslots;
 472
 473         for (i = 0; i < slots->nmemslots; ++i)
 474                 kvm_free_physmem_slot(&slots->memslots[i], NULL);
 475
 476         kfree(kvm->memslots);
 477 }
 478
 479 static void kvm_destroy_vm(struct kvm *kvm)
 480 {
 481         int i;
 482         struct mm_struct *mm = kvm->mm;
 483
 484         kvm_arch_sync_events(kvm);
 485         spin_lock(&kvm_lock);
 486         list_del(&kvm->vm_list);
 487         spin_unlock(&kvm_lock);
 488         kvm_free_irq_routing(kvm);
 489         for (i = 0; i < KVM_NR_BUSES; i++)
 490                 kvm_io_bus_destroy(kvm->buses[i]);
 491         kvm_coalesced_mmio_free(kvm);
 492 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 493         mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
 494 #else
 495         kvm_arch_flush_shadow(kvm);
 496 #endif
 497         kvm_arch_destroy_vm(kvm);
 498         hardware_disable_all();
 499         mmdrop(mm);
 500 }
 501
 502 void kvm_get_kvm(struct kvm *kvm)
 503 {
 504         atomic_inc(&kvm->users_count);
 505 }
 506 EXPORT_SYMBOL_GPL(kvm_get_kvm);
 507
 508 void kvm_put_kvm(struct kvm *kvm)
 509 {
 510         if (atomic_dec_and_test(&kvm->users_count))
 511                 kvm_destroy_vm(kvm);
 512 }
 513 EXPORT_SYMBOL_GPL(kvm_put_kvm);
 514
 515
 516 static int kvm_vm_release(struct inode *inode, struct file *filp)
 517 {
 518         struct kvm *kvm = filp->private_data;
 519
 520         kvm_irqfd_release(kvm);
 521
 522         kvm_put_kvm(kvm);
 523         return 0;
 524 }
 525
 526 /*
 527  * Allocate some memory and give it an address in the guest physical address
 528  * space.
 529  *
 530  * Discontiguous memory is allowed, mostly for framebuffers.
 531  *
 532  * Must be called holding mmap_sem for write.
 533  */
 534 int __kvm_set_memory_region(struct kvm *kvm,
 535                             struct kvm_userspace_memory_region *mem,
 536                             int user_alloc)
 537 {
 538         int r, flush_shadow = 0;
 539         gfn_t base_gfn;
 540         unsigned long npages;
 541         unsigned long i;
 542         struct kvm_memory_slot *memslot;
 543         struct kvm_memory_slot old, new;
 544         struct kvm_memslots *slots, *old_memslots;
 545
 546         r = -EINVAL;
 547         /* General sanity checks */
 548         if (mem->memory_size & (PAGE_SIZE - 1))
 549                 goto out;
 550         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
 551                 goto out;
 552         if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
 553                 goto out;
 554         if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
 555                 goto out;
 556         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
 557                 goto out;
 558
 559         memslot = &kvm->memslots->memslots[mem->slot];
 560         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
 561         npages = mem->memory_size >> PAGE_SHIFT;
 562
 563         r = -EINVAL;
 564         if (npages > KVM_MEM_MAX_NR_PAGES)
 565                 goto out;
 566
 567         if (!npages)
 568                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 569
 570         new = old = *memslot;
 571
 572         new.base_gfn = base_gfn;
 573         new.npages = npages;
 574         new.flags = mem->flags;
 575
 576         /* Disallow changing a memory slot's size. */
 577         r = -EINVAL;
 578         if (npages && old.npages && npages != old.npages)
 579                 goto out_free;
 580
 581         /* Check for overlaps */
 582         r = -EEXIST;
 583         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 584                 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
 585
 586                 if (s == memslot || !s->npages)
 587                         continue;
 588                 if (!((base_gfn + npages <= s->base_gfn) ||
 589                       (base_gfn >= s->base_gfn + s->npages)))
 590                         goto out_free;
 591         }
 592
 593         /* Free page dirty bitmap if unneeded */
 594         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
 595                 new.dirty_bitmap = NULL;
 596
 597         r = -ENOMEM;
 598
 599         /* Allocate if a slot is being created */
 600 #ifndef CONFIG_S390
 601         if (npages && !new.rmap) {
 602                 new.rmap = vmalloc(npages * sizeof(struct page *));
 603
 604                 if (!new.rmap)
 605                         goto out_free;
 606
 607                 memset(new.rmap, 0, npages * sizeof(*new.rmap));
 608
 609                 new.user_alloc = user_alloc;
 610                 new.userspace_addr = mem->userspace_addr;
 611         }
 612         if (!npages)
 613                 goto skip_lpage;
 614
 615         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
 616                 unsigned long ugfn;
 617                 unsigned long j;
 618                 int lpages;
 619                 int level = i + 2;
 620
 621                 /* Avoid unused variable warning if no large pages */
 622                 (void)level;
 623
 624                 if (new.lpage_info[i])
 625                         continue;
 626
 627                 lpages = 1 + (base_gfn + npages - 1) /
 628                              KVM_PAGES_PER_HPAGE(level);
 629                 lpages -= base_gfn / KVM_PAGES_PER_HPAGE(level);
 630
 631                 new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i]));
 632
 633                 if (!new.lpage_info[i])
 634                         goto out_free;
 635
 636                 memset(new.lpage_info[i], 0,
 637                        lpages * sizeof(*new.lpage_info[i]));
 638
 639                 if (base_gfn % KVM_PAGES_PER_HPAGE(level))
 640                         new.lpage_info[i][0].write_count = 1;
 641                 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE(level))
 642                         new.lpage_info[i][lpages - 1].write_count = 1;
 643                 ugfn = new.userspace_addr >> PAGE_SHIFT;
 644                 /*
 645                  * If the gfn and userspace address are not aligned wrt each
 646                  * other, or if explicitly asked to, disable large page
 647                  * support for this slot
 648                  */
 649                 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
 650                     !largepages_enabled)
 651                         for (j = 0; j < lpages; ++j)
 652                                 new.lpage_info[i][j].write_count = 1;
 653         }
 654
 655 skip_lpage:
 656
 657         /* Allocate page dirty bitmap if needed */
 658         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
 659                 unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(&new);
 660
 661                 new.dirty_bitmap = vmalloc(dirty_bytes);
 662                 if (!new.dirty_bitmap)
 663                         goto out_free;
 664                 memset(new.dirty_bitmap, 0, dirty_bytes);
 665                 /* destroy any largepage mappings for dirty tracking */
 666                 if (old.npages)
 667                         flush_shadow = 1;
 668         }
 669 #else  /* not defined CONFIG_S390 */
 670         new.user_alloc = user_alloc;
 671         if (user_alloc)
 672                 new.userspace_addr = mem->userspace_addr;
 673 #endif /* not defined CONFIG_S390 */
 674
 675         if (!npages) {
 676                 r = -ENOMEM;
 677                 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
 678                 if (!slots)
 679                         goto out_free;
 680                 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
 681                 if (mem->slot >= slots->nmemslots)
 682                         slots->nmemslots = mem->slot + 1;
 683                 slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
 684
 685                 old_memslots = kvm->memslots;
 686                 rcu_assign_pointer(kvm->memslots, slots);
 687                 synchronize_srcu_expedited(&kvm->srcu);
 688                 /* From this point no new shadow pages pointing to a deleted
 689                  * memslot will be created.
 690                  *
 691                  * validation of sp->gfn happens in:
 692                  *      - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
 693                  *      - kvm_is_visible_gfn (mmu_check_roots)
 694                  */
 695                 kvm_arch_flush_shadow(kvm);
 696                 kfree(old_memslots);
 697         }
 698
 699         r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
 700         if (r)
 701                 goto out_free;
 702
 703 #ifdef CONFIG_DMAR
 704         /* map the pages in iommu page table */
 705         if (npages) {
 706                 r = kvm_iommu_map_pages(kvm, &new);
 707                 if (r)
 708                         goto out_free;
 709         }
 710 #endif
 711
 712         r = -ENOMEM;
 713         slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
 714         if (!slots)
 715                 goto out_free;
 716         memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
 717         if (mem->slot >= slots->nmemslots)
 718                 slots->nmemslots = mem->slot + 1;
 719
 720         /* actual memory is freed via old in kvm_free_physmem_slot below */
 721         if (!npages) {
 722                 new.rmap = NULL;
 723                 new.dirty_bitmap = NULL;
 724                 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
 725                         new.lpage_info[i] = NULL;
 726         }
 727
 728         slots->memslots[mem->slot] = new;
 729         old_memslots = kvm->memslots;
 730         rcu_assign_pointer(kvm->memslots, slots);
 731         synchronize_srcu_expedited(&kvm->srcu);
 732
 733         kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
 734
 735         kvm_free_physmem_slot(&old, &new);
 736         kfree(old_memslots);
 737
 738         if (flush_shadow)
 739                 kvm_arch_flush_shadow(kvm);
 740
 741         return 0;
 742
 743 out_free:
 744         kvm_free_physmem_slot(&new, &old);
 745 out:
 746         return r;
 747
 748 }
 749 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
 750
 751 int kvm_set_memory_region(struct kvm *kvm,
 752                           struct kvm_userspace_memory_region *mem,
 753                           int user_alloc)
 754 {
 755         int r;
 756
 757         mutex_lock(&kvm->slots_lock);
 758         r = __kvm_set_memory_region(kvm, mem, user_alloc);
 759         mutex_unlock(&kvm->slots_lock);
 760         return r;
 761 }
 762 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
 763
 764 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 765                                    struct
 766                                    kvm_userspace_memory_region *mem,
 767                                    int user_alloc)
 768 {
 769         if (mem->slot >= KVM_MEMORY_SLOTS)
 770                 return -EINVAL;
 771         return kvm_set_memory_region(kvm, mem, user_alloc);
 772 }
 773
 774 int kvm_get_dirty_log(struct kvm *kvm,
 775                         struct kvm_dirty_log *log, int *is_dirty)
 776 {
 777         struct kvm_memory_slot *memslot;
 778         int r, i;
 779         unsigned long n;
 780         unsigned long any = 0;
 781
 782         r = -EINVAL;
 783         if (log->slot >= KVM_MEMORY_SLOTS)
 784                 goto out;
 785
 786         memslot = &kvm->memslots->memslots[log->slot];
 787         r = -ENOENT;
 788         if (!memslot->dirty_bitmap)
 789                 goto out;
 790
 791         n = kvm_dirty_bitmap_bytes(memslot);
 792
 793         for (i = 0; !any && i < n/sizeof(long); ++i)
 794                 any = memslot->dirty_bitmap[i];
 795
 796         r = -EFAULT;
 797         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
 798                 goto out;
 799
 800         if (any)
 801                 *is_dirty = 1;
 802
 803         r = 0;
 804 out:
 805         return r;
 806 }
 807
 808 void kvm_disable_largepages(void)
 809 {
 810         largepages_enabled = false;
 811 }
 812 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
 813
 814 int is_error_page(struct page *page)
 815 {
 816         return page == bad_page || page == hwpoison_page;
 817 }
 818 EXPORT_SYMBOL_GPL(is_error_page);
 819
 820 int is_error_pfn(pfn_t pfn)
 821 {
 822         return pfn == bad_pfn || pfn == hwpoison_pfn;
 823 }
 824 EXPORT_SYMBOL_GPL(is_error_pfn);
 825
 826 int is_hwpoison_pfn(pfn_t pfn)
 827 {
 828         return pfn == hwpoison_pfn;
 829 }
 830 EXPORT_SYMBOL_GPL(is_hwpoison_pfn);
 831
 832 static inline unsigned long bad_hva(void)
 833 {
 834         return PAGE_OFFSET;
 835 }
 836
 837 int kvm_is_error_hva(unsigned long addr)
 838 {
 839         return addr == bad_hva();
 840 }
 841 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
 842
 843 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
 844 {
 845         int i;
 846         struct kvm_memslots *slots = kvm_memslots(kvm);
 847
 848         for (i = 0; i < slots->nmemslots; ++i) {
 849                 struct kvm_memory_slot *memslot = &slots->memslots[i];
 850
 851                 if (gfn >= memslot->base_gfn
 852                     && gfn < memslot->base_gfn + memslot->npages)
 853                         return memslot;
 854         }
 855         return NULL;
 856 }
 857 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased);
 858
 859 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 860 {
 861         gfn = unalias_gfn(kvm, gfn);
 862         return gfn_to_memslot_unaliased(kvm, gfn);
 863 }
 864
 865 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
 866 {
 867         int i;
 868         struct kvm_memslots *slots = kvm_memslots(kvm);
 869
 870         gfn = unalias_gfn_instantiation(kvm, gfn);
 871         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 872                 struct kvm_memory_slot *memslot = &slots->memslots[i];
 873
 874                 if (memslot->flags & KVM_MEMSLOT_INVALID)
 875                         continue;
 876
 877                 if (gfn >= memslot->base_gfn
 878                     && gfn < memslot->base_gfn + memslot->npages)
 879                         return 1;
 880         }
 881         return 0;
 882 }
 883 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
 884
 885 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
 886 {
 887         struct vm_area_struct *vma;
 888         unsigned long addr, size;
 889
 890         size = PAGE_SIZE;
 891
 892         addr = gfn_to_hva(kvm, gfn);
 893         if (kvm_is_error_hva(addr))
 894                 return PAGE_SIZE;
 895
 896         down_read(&current->mm->mmap_sem);
 897         vma = find_vma(current->mm, addr);
 898         if (!vma)
 899                 goto out;
 900
 901         size = vma_kernel_pagesize(vma);
 902
 903 out:
 904         up_read(&current->mm->mmap_sem);
 905
 906         return size;
 907 }
 908
 909 int memslot_id(struct kvm *kvm, gfn_t gfn)
 910 {
 911         int i;
 912         struct kvm_memslots *slots = kvm_memslots(kvm);
 913         struct kvm_memory_slot *memslot = NULL;
 914
 915         gfn = unalias_gfn(kvm, gfn);
 916         for (i = 0; i < slots->nmemslots; ++i) {
 917                 memslot = &slots->memslots[i];
 918
 919                 if (gfn >= memslot->base_gfn
 920                     && gfn < memslot->base_gfn + memslot->npages)
 921                         break;
 922         }
 923
 924         return memslot - slots->memslots;
 925 }
 926
 927 static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
 928 {
 929         return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
 930 }
 931
 932 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
 933 {
 934         struct kvm_memory_slot *slot;
 935
 936         gfn = unalias_gfn_instantiation(kvm, gfn);
 937         slot = gfn_to_memslot_unaliased(kvm, gfn);
 938         if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
 939                 return bad_hva();
 940         return gfn_to_hva_memslot(slot, gfn);
 941 }
 942 EXPORT_SYMBOL_GPL(gfn_to_hva);
 943
 944 static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr)
 945 {
 946         struct page *page[1];
 947         int npages;
 948         pfn_t pfn;
 949
 950         might_sleep();
 951
 952         npages = get_user_pages_fast(addr, 1, 1, page);
 953
 954         if (unlikely(npages != 1)) {
 955                 struct vm_area_struct *vma;
 956
 957                 if (is_hwpoison_address(addr)) {
 958                         get_page(hwpoison_page);
 959                         return page_to_pfn(hwpoison_page);
 960                 }
 961
 962                 down_read(&current->mm->mmap_sem);
 963                 vma = find_vma(current->mm, addr);
 964
 965                 if (vma == NULL || addr < vma->vm_start ||
 966                     !(vma->vm_flags & VM_PFNMAP)) {
 967                         up_read(&current->mm->mmap_sem);
 968                         get_page(bad_page);
 969                         return page_to_pfn(bad_page);
 970                 }
 971
 972                 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
 973                 up_read(&current->mm->mmap_sem);
 974                 BUG_ON(!kvm_is_mmio_pfn(pfn));
 975         } else
 976                 pfn = page_to_pfn(page[0]);
 977
 978         return pfn;
 979 }
 980
 981 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
 982 {
 983         unsigned long addr;
 984
 985         addr = gfn_to_hva(kvm, gfn);
 986         if (kvm_is_error_hva(addr)) {
 987                 get_page(bad_page);
 988                 return page_to_pfn(bad_page);
 989         }
 990
 991         return hva_to_pfn(kvm, addr);
 992 }
 993 EXPORT_SYMBOL_GPL(gfn_to_pfn);
 994
 995 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
 996                          struct kvm_memory_slot *slot, gfn_t gfn)
 997 {
 998         unsigned long addr = gfn_to_hva_memslot(slot, gfn);
 999         return hva_to_pfn(kvm, addr);
1000 }
1001
1002 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1003 {
1004         pfn_t pfn;
1005
1006         pfn = gfn_to_pfn(kvm, gfn);
1007         if (!kvm_is_mmio_pfn(pfn))
1008                 return pfn_to_page(pfn);
1009
1010         WARN_ON(kvm_is_mmio_pfn(pfn));
1011
1012         get_page(bad_page);
1013         return bad_page;
1014 }
1015
1016 EXPORT_SYMBOL_GPL(gfn_to_page);
1017
1018 void kvm_release_page_clean(struct page *page)
1019 {
1020         kvm_release_pfn_clean(page_to_pfn(page));
1021 }
1022 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1023
1024 void kvm_release_pfn_clean(pfn_t pfn)
1025 {
1026         if (!kvm_is_mmio_pfn(pfn))
1027                 put_page(pfn_to_page(pfn));
1028 }
1029 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1030
1031 void kvm_release_page_dirty(struct page *page)
1032 {
1033         kvm_release_pfn_dirty(page_to_pfn(page));
1034 }
1035 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1036
1037 void kvm_release_pfn_dirty(pfn_t pfn)
1038 {
1039         kvm_set_pfn_dirty(pfn);
1040         kvm_release_pfn_clean(pfn);
1041 }
1042 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1043
1044 void kvm_set_page_dirty(struct page *page)
1045 {
1046         kvm_set_pfn_dirty(page_to_pfn(page));
1047 }
1048 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1049
1050 void kvm_set_pfn_dirty(pfn_t pfn)
1051 {
1052         if (!kvm_is_mmio_pfn(pfn)) {
1053                 struct page *page = pfn_to_page(pfn);
1054                 if (!PageReserved(page))
1055                         SetPageDirty(page);
1056         }
1057 }
1058 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1059
1060 void kvm_set_pfn_accessed(pfn_t pfn)
1061 {
1062         if (!kvm_is_mmio_pfn(pfn))
1063                 mark_page_accessed(pfn_to_page(pfn));
1064 }
1065 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1066
1067 void kvm_get_pfn(pfn_t pfn)
1068 {
1069         if (!kvm_is_mmio_pfn(pfn))
1070                 get_page(pfn_to_page(pfn));
1071 }
1072 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1073
1074 static int next_segment(unsigned long len, int offset)
1075 {
1076         if (len > PAGE_SIZE - offset)
1077                 return PAGE_SIZE - offset;
1078         else
1079                 return len;
1080 }
1081
1082 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1083                         int len)
1084 {
1085         int r;
1086         unsigned long addr;
1087
1088         addr = gfn_to_hva(kvm, gfn);
1089         if (kvm_is_error_hva(addr))
1090                 return -EFAULT;
1091         r = copy_from_user(data, (void __user *)addr + offset, len);
1092         if (r)
1093                 return -EFAULT;
1094         return 0;
1095 }
1096 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1097
1098 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1099 {
1100         gfn_t gfn = gpa >> PAGE_SHIFT;
1101         int seg;
1102         int offset = offset_in_page(gpa);
1103         int ret;
1104
1105         while ((seg = next_segment(len, offset)) != 0) {
1106                 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1107                 if (ret < 0)
1108                         return ret;
1109                 offset = 0;
1110                 len -= seg;
1111                 data += seg;
1112                 ++gfn;
1113         }
1114         return 0;
1115 }
1116 EXPORT_SYMBOL_GPL(kvm_read_guest);
1117
1118 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1119                           unsigned long len)
1120 {
1121         int r;
1122         unsigned long addr;
1123         gfn_t gfn = gpa >> PAGE_SHIFT;
1124         int offset = offset_in_page(gpa);
1125
1126         addr = gfn_to_hva(kvm, gfn);
1127         if (kvm_is_error_hva(addr))
1128                 return -EFAULT;
1129         pagefault_disable();
1130         r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1131         pagefault_enable();
1132         if (r)
1133                 return -EFAULT;
1134         return 0;
1135 }
1136 EXPORT_SYMBOL(kvm_read_guest_atomic);
1137
1138 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1139                          int offset, int len)
1140 {
1141         int r;
1142         unsigned long addr;
1143
1144         addr = gfn_to_hva(kvm, gfn);
1145         if (kvm_is_error_hva(addr))
1146                 return -EFAULT;
1147         r = copy_to_user((void __user *)addr + offset, data, len);
1148         if (r)
1149                 return -EFAULT;
1150         mark_page_dirty(kvm, gfn);
1151         return 0;
1152 }
1153 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1154
1155 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1156                     unsigned long len)
1157 {
1158         gfn_t gfn = gpa >> PAGE_SHIFT;
1159         int seg;
1160         int offset = offset_in_page(gpa);
1161         int ret;
1162
1163         while ((seg = next_segment(len, offset)) != 0) {
1164                 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1165                 if (ret < 0)
1166                         return ret;
1167                 offset = 0;
1168                 len -= seg;
1169                 data += seg;
1170                 ++gfn;
1171         }
1172         return 0;
1173 }
1174
1175 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1176 {
1177         return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
1178 }
1179 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1180
1181 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1182 {
1183         gfn_t gfn = gpa >> PAGE_SHIFT;
1184         int seg;
1185         int offset = offset_in_page(gpa);
1186         int ret;
1187
1188         while ((seg = next_segment(len, offset)) != 0) {
1189                 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1190                 if (ret < 0)
1191                         return ret;
1192                 offset = 0;
1193                 len -= seg;
1194                 ++gfn;
1195         }
1196         return 0;
1197 }
1198 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1199
1200 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1201 {
1202         struct kvm_memory_slot *memslot;
1203
1204         gfn = unalias_gfn(kvm, gfn);
1205         memslot = gfn_to_memslot_unaliased(kvm, gfn);
1206         if (memslot && memslot->dirty_bitmap) {
1207                 unsigned long rel_gfn = gfn - memslot->base_gfn;
1208
1209                 generic___set_le_bit(rel_gfn, memslot->dirty_bitmap);
1210         }
1211 }
1212
1213 /*
1214  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1215  */
1216 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1217 {
1218         DEFINE_WAIT(wait);
1219
1220         for (;;) {
1221                 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1222
1223                 if (kvm_arch_vcpu_runnable(vcpu)) {
1224                         set_bit(KVM_REQ_UNHALT, &vcpu->requests);
1225                         break;
1226                 }
1227                 if (kvm_cpu_has_pending_timer(vcpu))
1228                         break;
1229                 if (signal_pending(current))
1230                         break;
1231
1232                 schedule();
1233         }
1234
1235         finish_wait(&vcpu->wq, &wait);
1236 }
1237
1238 void kvm_resched(struct kvm_vcpu *vcpu)
1239 {
1240         if (!need_resched())
1241                 return;
1242         cond_resched();
1243 }
1244 EXPORT_SYMBOL_GPL(kvm_resched);
1245
1246 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu)
1247 {
1248         ktime_t expires;
1249         DEFINE_WAIT(wait);
1250
1251         prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1252
1253         /* Sleep for 100 us, and hope lock-holder got scheduled */
1254         expires = ktime_add_ns(ktime_get(), 100000UL);
1255         schedule_hrtimeout(&expires, HRTIMER_MODE_ABS);
1256
1257         finish_wait(&vcpu->wq, &wait);
1258 }
1259 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1260
1261 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1262 {
1263         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1264         struct page *page;
1265
1266         if (vmf->pgoff == 0)
1267                 page = virt_to_page(vcpu->run);
1268 #ifdef CONFIG_X86
1269         else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1270                 page = virt_to_page(vcpu->arch.pio_data);
1271 #endif
1272 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1273         else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1274                 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1275 #endif
1276         else
1277                 return VM_FAULT_SIGBUS;
1278         get_page(page);
1279         vmf->page = page;
1280         return 0;
1281 }
1282
1283 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1284         .fault = kvm_vcpu_fault,
1285 };
1286
1287 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1288 {
1289         vma->vm_ops = &kvm_vcpu_vm_ops;
1290         return 0;
1291 }
1292
1293 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1294 {
1295         struct kvm_vcpu *vcpu = filp->private_data;
1296
1297         kvm_put_kvm(vcpu->kvm);
1298         return 0;
1299 }
1300
1301 static struct file_operations kvm_vcpu_fops = {
1302         .release        = kvm_vcpu_release,
1303         .unlocked_ioctl = kvm_vcpu_ioctl,
1304         .compat_ioctl   = kvm_vcpu_ioctl,
1305         .mmap           = kvm_vcpu_mmap,
1306 };
1307
1308 /*
1309  * Allocates an inode for the vcpu.
1310  */
1311 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1312 {
1313         return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1314 }
1315
1316 /*
1317  * Creates some virtual cpus.  Good luck creating more than one.
1318  */
1319 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1320 {
1321         int r;
1322         struct kvm_vcpu *vcpu, *v;
1323
1324         vcpu = kvm_arch_vcpu_create(kvm, id);
1325         if (IS_ERR(vcpu))
1326                 return PTR_ERR(vcpu);
1327
1328         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1329
1330         r = kvm_arch_vcpu_setup(vcpu);
1331         if (r)
1332                 return r;
1333
1334         mutex_lock(&kvm->lock);
1335         if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1336                 r = -EINVAL;
1337                 goto vcpu_destroy;
1338         }
1339
1340         kvm_for_each_vcpu(r, v, kvm)
1341                 if (v->vcpu_id == id) {
1342                         r = -EEXIST;
1343                         goto vcpu_destroy;
1344                 }
1345
1346         BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1347
1348         /* Now it's all set up, let userspace reach it */
1349         kvm_get_kvm(kvm);
1350         r = create_vcpu_fd(vcpu);
1351         if (r < 0) {
1352                 kvm_put_kvm(kvm);
1353                 goto vcpu_destroy;
1354         }
1355
1356         kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1357         smp_wmb();
1358         atomic_inc(&kvm->online_vcpus);
1359
1360 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1361         if (kvm->bsp_vcpu_id == id)
1362                 kvm->bsp_vcpu = vcpu;
1363 #endif
1364         mutex_unlock(&kvm->lock);
1365         return r;
1366
1367 vcpu_destroy:
1368         mutex_unlock(&kvm->lock);
1369         kvm_arch_vcpu_destroy(vcpu);
1370         return r;
1371 }
1372
1373 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1374 {
1375         if (sigset) {
1376                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1377                 vcpu->sigset_active = 1;
1378                 vcpu->sigset = *sigset;
1379         } else
1380                 vcpu->sigset_active = 0;
1381         return 0;
1382 }
1383
1384 static long kvm_vcpu_ioctl(struct file *filp,
1385                            unsigned int ioctl, unsigned long arg)
1386 {
1387         struct kvm_vcpu *vcpu = filp->private_data;
1388         void __user *argp = (void __user *)arg;
1389         int r;
1390         struct kvm_fpu *fpu = NULL;
1391         struct kvm_sregs *kvm_sregs = NULL;
1392
1393         if (vcpu->kvm->mm != current->mm)
1394                 return -EIO;
1395         switch (ioctl) {
1396         case KVM_RUN:
1397                 r = -EINVAL;
1398                 if (arg)
1399                         goto out;
1400                 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1401                 break;
1402         case KVM_GET_REGS: {
1403                 struct kvm_regs *kvm_regs;
1404
1405                 r = -ENOMEM;
1406                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1407                 if (!kvm_regs)
1408                         goto out;
1409                 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1410                 if (r)
1411                         goto out_free1;
1412                 r = -EFAULT;
1413                 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1414                         goto out_free1;
1415                 r = 0;
1416 out_free1:
1417                 kfree(kvm_regs);
1418                 break;
1419         }
1420         case KVM_SET_REGS: {
1421                 struct kvm_regs *kvm_regs;
1422
1423                 r = -ENOMEM;
1424                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1425                 if (!kvm_regs)
1426                         goto out;
1427                 r = -EFAULT;
1428                 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1429                         goto out_free2;
1430                 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1431                 if (r)
1432                         goto out_free2;
1433                 r = 0;
1434 out_free2:
1435                 kfree(kvm_regs);
1436                 break;
1437         }
1438         case KVM_GET_SREGS: {
1439                 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1440                 r = -ENOMEM;
1441                 if (!kvm_sregs)
1442                         goto out;
1443                 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1444                 if (r)
1445                         goto out;
1446                 r = -EFAULT;
1447                 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1448                         goto out;
1449                 r = 0;
1450                 break;
1451         }
1452         case KVM_SET_SREGS: {
1453                 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1454                 r = -ENOMEM;
1455                 if (!kvm_sregs)
1456                         goto out;
1457                 r = -EFAULT;
1458                 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1459                         goto out;
1460                 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1461                 if (r)
1462                         goto out;
1463                 r = 0;
1464                 break;
1465         }
1466         case KVM_GET_MP_STATE: {
1467                 struct kvm_mp_state mp_state;
1468
1469                 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1470                 if (r)
1471                         goto out;
1472                 r = -EFAULT;
1473                 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1474                         goto out;
1475                 r = 0;
1476                 break;
1477         }
1478         case KVM_SET_MP_STATE: {
1479                 struct kvm_mp_state mp_state;
1480
1481                 r = -EFAULT;
1482                 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1483                         goto out;
1484                 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1485                 if (r)
1486                         goto out;
1487                 r = 0;
1488                 break;
1489         }
1490         case KVM_TRANSLATE: {
1491                 struct kvm_translation tr;
1492
1493                 r = -EFAULT;
1494                 if (copy_from_user(&tr, argp, sizeof tr))
1495                         goto out;
1496                 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1497                 if (r)
1498                         goto out;
1499                 r = -EFAULT;
1500                 if (copy_to_user(argp, &tr, sizeof tr))
1501                         goto out;
1502                 r = 0;
1503                 break;
1504         }
1505         case KVM_SET_GUEST_DEBUG: {
1506                 struct kvm_guest_debug dbg;
1507
1508                 r = -EFAULT;
1509                 if (copy_from_user(&dbg, argp, sizeof dbg))
1510                         goto out;
1511                 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1512                 if (r)
1513                         goto out;
1514                 r = 0;
1515                 break;
1516         }
1517         case KVM_SET_SIGNAL_MASK: {
1518                 struct kvm_signal_mask __user *sigmask_arg = argp;
1519                 struct kvm_signal_mask kvm_sigmask;
1520                 sigset_t sigset, *p;
1521
1522                 p = NULL;
1523                 if (argp) {
1524                         r = -EFAULT;
1525                         if (copy_from_user(&kvm_sigmask, argp,
1526                                            sizeof kvm_sigmask))
1527                                 goto out;
1528                         r = -EINVAL;
1529                         if (kvm_sigmask.len != sizeof sigset)
1530                                 goto out;
1531                         r = -EFAULT;
1532                         if (copy_from_user(&sigset, sigmask_arg->sigset,
1533                                            sizeof sigset))
1534                                 goto out;
1535                         p = &sigset;
1536                 }
1537                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1538                 break;
1539         }
1540         case KVM_GET_FPU: {
1541                 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1542                 r = -ENOMEM;
1543                 if (!fpu)
1544                         goto out;
1545                 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1546                 if (r)
1547                         goto out;
1548                 r = -EFAULT;
1549                 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1550                         goto out;
1551                 r = 0;
1552                 break;
1553         }
1554         case KVM_SET_FPU: {
1555                 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1556                 r = -ENOMEM;
1557                 if (!fpu)
1558                         goto out;
1559                 r = -EFAULT;
1560                 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1561                         goto out;
1562                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1563                 if (r)
1564                         goto out;
1565                 r = 0;
1566                 break;
1567         }
1568         default:
1569                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1570         }
1571 out:
1572         kfree(fpu);
1573         kfree(kvm_sregs);
1574         return r;
1575 }
1576
1577 static long kvm_vm_ioctl(struct file *filp,
1578                            unsigned int ioctl, unsigned long arg)
1579 {
1580         struct kvm *kvm = filp->private_data;
1581         void __user *argp = (void __user *)arg;
1582         int r;
1583
1584         if (kvm->mm != current->mm)
1585                 return -EIO;
1586         switch (ioctl) {
1587         case KVM_CREATE_VCPU:
1588                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1589                 if (r < 0)
1590                         goto out;
1591                 break;
1592         case KVM_SET_USER_MEMORY_REGION: {
1593                 struct kvm_userspace_memory_region kvm_userspace_mem;
1594
1595                 r = -EFAULT;
1596                 if (copy_from_user(&kvm_userspace_mem, argp,
1597                                                 sizeof kvm_userspace_mem))
1598                         goto out;
1599
1600                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1601                 if (r)
1602                         goto out;
1603                 break;
1604         }
1605         case KVM_GET_DIRTY_LOG: {
1606                 struct kvm_dirty_log log;
1607
1608                 r = -EFAULT;
1609                 if (copy_from_user(&log, argp, sizeof log))
1610                         goto out;
1611                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1612                 if (r)
1613                         goto out;
1614                 break;
1615         }
1616 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1617         case KVM_REGISTER_COALESCED_MMIO: {
1618                 struct kvm_coalesced_mmio_zone zone;
1619                 r = -EFAULT;
1620                 if (copy_from_user(&zone, argp, sizeof zone))
1621                         goto out;
1622                 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1623                 if (r)
1624                         goto out;
1625                 r = 0;
1626                 break;
1627         }
1628         case KVM_UNREGISTER_COALESCED_MMIO: {
1629                 struct kvm_coalesced_mmio_zone zone;
1630                 r = -EFAULT;
1631                 if (copy_from_user(&zone, argp, sizeof zone))
1632                         goto out;
1633                 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1634                 if (r)
1635                         goto out;
1636                 r = 0;
1637                 break;
1638         }
1639 #endif
1640         case KVM_IRQFD: {
1641                 struct kvm_irqfd data;
1642
1643                 r = -EFAULT;
1644                 if (copy_from_user(&data, argp, sizeof data))
1645                         goto out;
1646                 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
1647                 break;
1648         }
1649         case KVM_IOEVENTFD: {
1650                 struct kvm_ioeventfd data;
1651
1652                 r = -EFAULT;
1653                 if (copy_from_user(&data, argp, sizeof data))
1654                         goto out;
1655                 r = kvm_ioeventfd(kvm, &data);
1656                 break;
1657         }
1658 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1659         case KVM_SET_BOOT_CPU_ID:
1660                 r = 0;
1661                 mutex_lock(&kvm->lock);
1662                 if (atomic_read(&kvm->online_vcpus) != 0)
1663                         r = -EBUSY;
1664                 else
1665                         kvm->bsp_vcpu_id = arg;
1666                 mutex_unlock(&kvm->lock);
1667                 break;
1668 #endif
1669         default:
1670                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1671                 if (r == -ENOTTY)
1672                         r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
1673         }
1674 out:
1675         return r;
1676 }
1677
1678 #ifdef CONFIG_COMPAT
1679 struct compat_kvm_dirty_log {
1680         __u32 slot;
1681         __u32 padding1;
1682         union {
1683                 compat_uptr_t dirty_bitmap; /* one bit per page */
1684                 __u64 padding2;
1685         };
1686 };
1687
1688 static long kvm_vm_compat_ioctl(struct file *filp,
1689                            unsigned int ioctl, unsigned long arg)
1690 {
1691         struct kvm *kvm = filp->private_data;
1692         int r;
1693
1694         if (kvm->mm != current->mm)
1695                 return -EIO;
1696         switch (ioctl) {
1697         case KVM_GET_DIRTY_LOG: {
1698                 struct compat_kvm_dirty_log compat_log;
1699                 struct kvm_dirty_log log;
1700
1701                 r = -EFAULT;
1702                 if (copy_from_user(&compat_log, (void __user *)arg,
1703                                    sizeof(compat_log)))
1704                         goto out;
1705                 log.slot         = compat_log.slot;
1706                 log.padding1     = compat_log.padding1;
1707                 log.padding2     = compat_log.padding2;
1708                 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
1709
1710                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1711                 if (r)
1712                         goto out;
1713                 break;
1714         }
1715         default:
1716                 r = kvm_vm_ioctl(filp, ioctl, arg);
1717         }
1718
1719 out:
1720         return r;
1721 }
1722 #endif
1723
1724 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1725 {
1726         struct page *page[1];
1727         unsigned long addr;
1728         int npages;
1729         gfn_t gfn = vmf->pgoff;
1730         struct kvm *kvm = vma->vm_file->private_data;
1731
1732         addr = gfn_to_hva(kvm, gfn);
1733         if (kvm_is_error_hva(addr))
1734                 return VM_FAULT_SIGBUS;
1735
1736         npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
1737                                 NULL);
1738         if (unlikely(npages != 1))
1739                 return VM_FAULT_SIGBUS;
1740
1741         vmf->page = page[0];
1742         return 0;
1743 }
1744
1745 static const struct vm_operations_struct kvm_vm_vm_ops = {
1746         .fault = kvm_vm_fault,
1747 };
1748
1749 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1750 {
1751         vma->vm_ops = &kvm_vm_vm_ops;
1752         return 0;
1753 }
1754
1755 static struct file_operations kvm_vm_fops = {
1756         .release        = kvm_vm_release,
1757         .unlocked_ioctl = kvm_vm_ioctl,
1758 #ifdef CONFIG_COMPAT
1759         .compat_ioctl   = kvm_vm_compat_ioctl,
1760 #endif
1761         .mmap           = kvm_vm_mmap,
1762 };
1763
1764 static int kvm_dev_ioctl_create_vm(void)
1765 {
1766         int fd, r;
1767         struct kvm *kvm;
1768
1769         kvm = kvm_create_vm();
1770         if (IS_ERR(kvm))
1771                 return PTR_ERR(kvm);
1772 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1773         r = kvm_coalesced_mmio_init(kvm);
1774         if (r < 0) {
1775                 kvm_put_kvm(kvm);
1776                 return r;
1777         }
1778 #endif
1779         fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
1780         if (fd < 0)
1781                 kvm_put_kvm(kvm);
1782
1783         return fd;
1784 }
1785
1786 static long kvm_dev_ioctl_check_extension_generic(long arg)
1787 {
1788         switch (arg) {
1789         case KVM_CAP_USER_MEMORY:
1790         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
1791         case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
1792 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1793         case KVM_CAP_SET_BOOT_CPU_ID:
1794 #endif
1795         case KVM_CAP_INTERNAL_ERROR_DATA:
1796                 return 1;
1797 #ifdef CONFIG_HAVE_KVM_IRQCHIP
1798         case KVM_CAP_IRQ_ROUTING:
1799                 return KVM_MAX_IRQ_ROUTES;
1800 #endif
1801         default:
1802                 break;
1803         }
1804         return kvm_dev_ioctl_check_extension(arg);
1805 }
1806
1807 static long kvm_dev_ioctl(struct file *filp,
1808                           unsigned int ioctl, unsigned long arg)
1809 {
1810         long r = -EINVAL;
1811
1812         switch (ioctl) {
1813         case KVM_GET_API_VERSION:
1814                 r = -EINVAL;
1815                 if (arg)
1816                         goto out;
1817                 r = KVM_API_VERSION;
1818                 break;
1819         case KVM_CREATE_VM:
1820                 r = -EINVAL;
1821                 if (arg)
1822                         goto out;
1823                 r = kvm_dev_ioctl_create_vm();
1824                 break;
1825         case KVM_CHECK_EXTENSION:
1826                 r = kvm_dev_ioctl_check_extension_generic(arg);
1827                 break;
1828         case KVM_GET_VCPU_MMAP_SIZE:
1829                 r = -EINVAL;
1830                 if (arg)
1831                         goto out;
1832                 r = PAGE_SIZE;     /* struct kvm_run */
1833 #ifdef CONFIG_X86
1834                 r += PAGE_SIZE;    /* pio data page */
1835 #endif
1836 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1837                 r += PAGE_SIZE;    /* coalesced mmio ring page */
1838 #endif
1839                 break;
1840         case KVM_TRACE_ENABLE:
1841         case KVM_TRACE_PAUSE:
1842         case KVM_TRACE_DISABLE:
1843                 r = -EOPNOTSUPP;
1844                 break;
1845         default:
1846                 return kvm_arch_dev_ioctl(filp, ioctl, arg);
1847         }
1848 out:
1849         return r;
1850 }
1851
1852 static struct file_operations kvm_chardev_ops = {
1853         .unlocked_ioctl = kvm_dev_ioctl,
1854         .compat_ioctl   = kvm_dev_ioctl,
1855 };
1856
1857 static struct miscdevice kvm_dev = {
1858         KVM_MINOR,
1859         "kvm",
1860         &kvm_chardev_ops,
1861 };
1862
1863 static void hardware_enable(void *junk)
1864 {
1865         int cpu = raw_smp_processor_id();
1866         int r;
1867
1868         if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
1869                 return;
1870
1871         cpumask_set_cpu(cpu, cpus_hardware_enabled);
1872
1873         r = kvm_arch_hardware_enable(NULL);
1874
1875         if (r) {
1876                 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
1877                 atomic_inc(&hardware_enable_failed);
1878                 printk(KERN_INFO "kvm: enabling virtualization on "
1879                                  "CPU%d failed\n", cpu);
1880         }
1881 }
1882
1883 static void hardware_disable(void *junk)
1884 {
1885         int cpu = raw_smp_processor_id();
1886
1887         if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
1888                 return;
1889         cpumask_clear_cpu(cpu, cpus_hardware_enabled);
1890         kvm_arch_hardware_disable(NULL);
1891 }
1892
1893 static void hardware_disable_all_nolock(void)
1894 {
1895         BUG_ON(!kvm_usage_count);
1896
1897         kvm_usage_count--;
1898         if (!kvm_usage_count)
1899                 on_each_cpu(hardware_disable, NULL, 1);
1900 }
1901
1902 static void hardware_disable_all(void)
1903 {
1904         spin_lock(&kvm_lock);
1905         hardware_disable_all_nolock();
1906         spin_unlock(&kvm_lock);
1907 }
1908
1909 static int hardware_enable_all(void)
1910 {
1911         int r = 0;
1912
1913         spin_lock(&kvm_lock);
1914
1915         kvm_usage_count++;
1916         if (kvm_usage_count == 1) {
1917                 atomic_set(&hardware_enable_failed, 0);
1918                 on_each_cpu(hardware_enable, NULL, 1);
1919
1920                 if (atomic_read(&hardware_enable_failed)) {
1921                         hardware_disable_all_nolock();
1922                         r = -EBUSY;
1923                 }
1924         }
1925
1926         spin_unlock(&kvm_lock);
1927
1928         return r;
1929 }
1930
1931 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1932                            void *v)
1933 {
1934         int cpu = (long)v;
1935
1936         if (!kvm_usage_count)
1937                 return NOTIFY_OK;
1938
1939         val &= ~CPU_TASKS_FROZEN;
1940         switch (val) {
1941         case CPU_DYING:
1942                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1943                        cpu);
1944                 hardware_disable(NULL);
1945                 break;
1946         case CPU_ONLINE:
1947                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1948                        cpu);
1949                 smp_call_function_single(cpu, hardware_enable, NULL, 1);
1950                 break;
1951         }
1952         return NOTIFY_OK;
1953 }
1954
1955
1956 asmlinkage void kvm_handle_fault_on_reboot(void)
1957 {
1958         if (kvm_rebooting)
1959                 /* spin while reset goes on */
1960                 while (true)
1961                         ;
1962         /* Fault while not rebooting.  We want the trace. */
1963         BUG();
1964 }
1965 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
1966
1967 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1968                       void *v)
1969 {
1970         /*
1971          * Some (well, at least mine) BIOSes hang on reboot if
1972          * in vmx root mode.
1973          *
1974          * And Intel TXT required VMX off for all cpu when system shutdown.
1975          */
1976         printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1977         kvm_rebooting = true;
1978         on_each_cpu(hardware_disable, NULL, 1);
1979         return NOTIFY_OK;
1980 }
1981
1982 static struct notifier_block kvm_reboot_notifier = {
1983         .notifier_call = kvm_reboot,
1984         .priority = 0,
1985 };
1986
1987 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
1988 {
1989         int i;
1990
1991         for (i = 0; i < bus->dev_count; i++) {
1992                 struct kvm_io_device *pos = bus->devs[i];
1993
1994                 kvm_iodevice_destructor(pos);
1995         }
1996         kfree(bus);
1997 }
1998
1999 /* kvm_io_bus_write - called under kvm->slots_lock */
2000 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2001                      int len, const void *val)
2002 {
2003         int i;
2004         struct kvm_io_bus *bus;
2005
2006         bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2007         for (i = 0; i < bus->dev_count; i++)
2008                 if (!kvm_iodevice_write(bus->devs[i], addr, len, val))
2009                         return 0;
2010         return -EOPNOTSUPP;
2011 }
2012
2013 /* kvm_io_bus_read - called under kvm->slots_lock */
2014 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2015                     int len, void *val)
2016 {
2017         int i;
2018         struct kvm_io_bus *bus;
2019
2020         bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2021         for (i = 0; i < bus->dev_count; i++)
2022                 if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
2023                         return 0;
2024         return -EOPNOTSUPP;
2025 }
2026
2027 /* Caller must hold slots_lock. */
2028 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2029                             struct kvm_io_device *dev)
2030 {
2031         struct kvm_io_bus *new_bus, *bus;
2032
2033         bus = kvm->buses[bus_idx];
2034         if (bus->dev_count > NR_IOBUS_DEVS-1)
2035                 return -ENOSPC;
2036
2037         new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2038         if (!new_bus)
2039                 return -ENOMEM;
2040         memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2041         new_bus->devs[new_bus->dev_count++] = dev;
2042         rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2043         synchronize_srcu_expedited(&kvm->srcu);
2044         kfree(bus);
2045
2046         return 0;
2047 }
2048
2049 /* Caller must hold slots_lock. */
2050 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2051                               struct kvm_io_device *dev)
2052 {
2053         int i, r;
2054         struct kvm_io_bus *new_bus, *bus;
2055
2056         new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2057         if (!new_bus)
2058                 return -ENOMEM;
2059
2060         bus = kvm->buses[bus_idx];
2061         memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2062
2063         r = -ENOENT;
2064         for (i = 0; i < new_bus->dev_count; i++)
2065                 if (new_bus->devs[i] == dev) {
2066                         r = 0;
2067                         new_bus->devs[i] = new_bus->devs[--new_bus->dev_count];
2068                         break;
2069                 }
2070
2071         if (r) {
2072                 kfree(new_bus);
2073                 return r;
2074         }
2075
2076         rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2077         synchronize_srcu_expedited(&kvm->srcu);
2078         kfree(bus);
2079         return r;
2080 }
2081
2082 static struct notifier_block kvm_cpu_notifier = {
2083         .notifier_call = kvm_cpu_hotplug,
2084         .priority = 20, /* must be > scheduler priority */
2085 };
2086
2087 static int vm_stat_get(void *_offset, u64 *val)
2088 {
2089         unsigned offset = (long)_offset;
2090         struct kvm *kvm;
2091
2092         *val = 0;
2093         spin_lock(&kvm_lock);
2094         list_for_each_entry(kvm, &vm_list, vm_list)
2095                 *val += *(u32 *)((void *)kvm + offset);
2096         spin_unlock(&kvm_lock);
2097         return 0;
2098 }
2099
2100 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2101
2102 static int vcpu_stat_get(void *_offset, u64 *val)
2103 {
2104         unsigned offset = (long)_offset;
2105         struct kvm *kvm;
2106         struct kvm_vcpu *vcpu;
2107         int i;
2108
2109         *val = 0;
2110         spin_lock(&kvm_lock);
2111         list_for_each_entry(kvm, &vm_list, vm_list)
2112                 kvm_for_each_vcpu(i, vcpu, kvm)
2113                         *val += *(u32 *)((void *)vcpu + offset);
2114
2115         spin_unlock(&kvm_lock);
2116         return 0;
2117 }
2118
2119 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2120
2121 static const struct file_operations *stat_fops[] = {
2122         [KVM_STAT_VCPU] = &vcpu_stat_fops,
2123         [KVM_STAT_VM]   = &vm_stat_fops,
2124 };
2125
2126 static void kvm_init_debug(void)
2127 {
2128         struct kvm_stats_debugfs_item *p;
2129
2130         kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2131         for (p = debugfs_entries; p->name; ++p)
2132                 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2133                                                 (void *)(long)p->offset,
2134                                                 stat_fops[p->kind]);
2135 }
2136
2137 static void kvm_exit_debug(void)
2138 {
2139         struct kvm_stats_debugfs_item *p;
2140
2141         for (p = debugfs_entries; p->name; ++p)
2142                 debugfs_remove(p->dentry);
2143         debugfs_remove(kvm_debugfs_dir);
2144 }
2145
2146 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2147 {
2148         if (kvm_usage_count)
2149                 hardware_disable(NULL);
2150         return 0;
2151 }
2152
2153 static int kvm_resume(struct sys_device *dev)
2154 {
2155         if (kvm_usage_count)
2156                 hardware_enable(NULL);
2157         return 0;
2158 }
2159
2160 static struct sysdev_class kvm_sysdev_class = {
2161         .name = "kvm",
2162         .suspend = kvm_suspend,
2163         .resume = kvm_resume,
2164 };
2165
2166 static struct sys_device kvm_sysdev = {
2167         .id = 0,
2168         .cls = &kvm_sysdev_class,
2169 };
2170
2171 struct page *bad_page;
2172 pfn_t bad_pfn;
2173
2174 static inline
2175 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2176 {
2177         return container_of(pn, struct kvm_vcpu, preempt_notifier);
2178 }
2179
2180 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2181 {
2182         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2183
2184         kvm_arch_vcpu_load(vcpu, cpu);
2185 }
2186
2187 static void kvm_sched_out(struct preempt_notifier *pn,
2188                           struct task_struct *next)
2189 {
2190         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2191
2192         kvm_arch_vcpu_put(vcpu);
2193 }
2194
2195 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
2196                   struct module *module)
2197 {
2198         int r;
2199         int cpu;
2200
2201         r = kvm_arch_init(opaque);
2202         if (r)
2203                 goto out_fail;
2204
2205         bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2206
2207         if (bad_page == NULL) {
2208                 r = -ENOMEM;
2209                 goto out;
2210         }
2211
2212         bad_pfn = page_to_pfn(bad_page);
2213
2214         hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2215
2216         if (hwpoison_page == NULL) {
2217                 r = -ENOMEM;
2218                 goto out_free_0;
2219         }
2220
2221         hwpoison_pfn = page_to_pfn(hwpoison_page);
2222
2223         if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2224                 r = -ENOMEM;
2225                 goto out_free_0;
2226         }
2227
2228         r = kvm_arch_hardware_setup();
2229         if (r < 0)
2230                 goto out_free_0a;
2231
2232         for_each_online_cpu(cpu) {
2233                 smp_call_function_single(cpu,
2234                                 kvm_arch_check_processor_compat,
2235                                 &r, 1);
2236                 if (r < 0)
2237                         goto out_free_1;
2238         }
2239
2240         r = register_cpu_notifier(&kvm_cpu_notifier);
2241         if (r)
2242                 goto out_free_2;
2243         register_reboot_notifier(&kvm_reboot_notifier);
2244
2245         r = sysdev_class_register(&kvm_sysdev_class);
2246         if (r)
2247                 goto out_free_3;
2248
2249         r = sysdev_register(&kvm_sysdev);
2250         if (r)
2251                 goto out_free_4;
2252
2253         /* A kmem cache lets us meet the alignment requirements of fx_save. */
2254         if (!vcpu_align)
2255                 vcpu_align = __alignof__(struct kvm_vcpu);
2256         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
2257                                            0, NULL);
2258         if (!kvm_vcpu_cache) {
2259                 r = -ENOMEM;
2260                 goto out_free_5;
2261         }
2262
2263         kvm_chardev_ops.owner = module;
2264         kvm_vm_fops.owner = module;
2265         kvm_vcpu_fops.owner = module;
2266
2267         r = misc_register(&kvm_dev);
2268         if (r) {
2269                 printk(KERN_ERR "kvm: misc device register failed\n");
2270                 goto out_free;
2271         }
2272
2273         kvm_preempt_ops.sched_in = kvm_sched_in;
2274         kvm_preempt_ops.sched_out = kvm_sched_out;
2275
2276         kvm_init_debug();
2277
2278         return 0;
2279
2280 out_free:
2281         kmem_cache_destroy(kvm_vcpu_cache);
2282 out_free_5:
2283         sysdev_unregister(&kvm_sysdev);
2284 out_free_4:
2285         sysdev_class_unregister(&kvm_sysdev_class);
2286 out_free_3:
2287         unregister_reboot_notifier(&kvm_reboot_notifier);
2288         unregister_cpu_notifier(&kvm_cpu_notifier);
2289 out_free_2:
2290 out_free_1:
2291         kvm_arch_hardware_unsetup();
2292 out_free_0a:
2293         free_cpumask_var(cpus_hardware_enabled);
2294 out_free_0:
2295         if (hwpoison_page)
2296                 __free_page(hwpoison_page);
2297         __free_page(bad_page);
2298 out:
2299         kvm_arch_exit();
2300 out_fail:
2301         return r;
2302 }
2303 EXPORT_SYMBOL_GPL(kvm_init);
2304
2305 void kvm_exit(void)
2306 {
2307         kvm_exit_debug();
2308         misc_deregister(&kvm_dev);
2309         kmem_cache_destroy(kvm_vcpu_cache);
2310         sysdev_unregister(&kvm_sysdev);
2311         sysdev_class_unregister(&kvm_sysdev_class);
2312         unregister_reboot_notifier(&kvm_reboot_notifier);
2313         unregister_cpu_notifier(&kvm_cpu_notifier);
2314         on_each_cpu(hardware_disable, NULL, 1);
2315         kvm_arch_hardware_unsetup();
2316         kvm_arch_exit();
2317         free_cpumask_var(cpus_hardware_enabled);
2318         __free_page(hwpoison_page);
2319         __free_page(bad_page);
2320 }
2321 EXPORT_SYMBOL_GPL(kvm_exit);